Details of Grant 

EPSRC Reference:	GR/N64854/01
Title:	GEOMETRIC QUANTUM COMPUTATION, DECOHERENCE AND IRREVERSIBILITY
Principal Investigator:	Vedral, Professor V
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department:	Physics
Organisation:	Imperial College London
Scheme:	Fast Stream
Starts:	01 October 2000	Ends:	30 September 2003	Value (£):	54,974
EPSRC Research Topic Classifications:	Quantum Optics & Information
EPSRC Industrial Sector Classifications:	No relevance to Underpinning Sectors
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Panel History:
Summary on Grant Application Form
Recently the interest in quantum computation has been growing rapidly due to very exciting theoretical development accompanied by steady experimental progress. However, due to decoherence it is very difficult to maintain large scale quantum computational processes. I plan to study decoherence in quantum computation and intrinsic ways of combating it. I propose to investigate the computational process where the gates between quantum bits comprising a quantum computer are based on the Berry phase. Since the size of the phase depends purely on the geometry, this, at least in principle, offers a more robust way to execute quantum computation. Secondly I plan to investigate the nature of irreversibility in quantum information processing in general. I will exploit the relationship between information theory and thermodynamics, culminating in the work of Jaynes and in Landauer's principle, that any erasure of information involves a corresponding increase in entropy in the environment. I will concentrate on general entanglement dynamics in a decohering environment. This I will do by generalizing the Landauer's principle to quantum mechanics. The entropic measures of entanglement and classical information I have developed previously will be utilised to express the relationship between entanglement Loss in decoherence and the corresponding entropy increase.
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Organisation Website:	http://www.imperial.ac.uk